.: I haven't passed this past legal review so for what its worth: Part of my standard requirements for everyone include income is at least 3X rent, minimum credit score, say 640, Clean record and no evictions as well as deposit is paid in full at signing of lease and 1st month rent is paid in full prior to handing over the keys.

The current owner bought it for $30K and I know they had to clean up a lot of title work and started doing repairs. 

Have contracts or covenants that keep newer homes there and keeping yards clean.  

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It would be wise to rectify it before transfer of title so your starting off clean and hopefully won't have any issues when you go to sell down the road. 

I have helped quite a few investors dispose of their 2-4 units this year and they have been cleaning house.  

I know hosts have included additional cleaning fees for violations as a deterrent.If none of these solutions work, you could look into completely independent HVAC systems for the two units, though that would be a bigger upfront investment.

This was a clean foreclosure property, which is usually difficult to find.

I am assuming in this that normal cleaning was done pre-occupancy and they are excessive in their expectations.

I know they are crazy guest friendly but this seems over the top.Guest didn't deny it....responded with "I payed the cleaning fee, why would I clean up?"